SR4121 over I73 & US421
GoodGuilford County, North Carolina · 0.8 Mi. S. Jct. SR1129 · Structure no. 000000000810873
- Built
- 2008
- 17 years old
- Condition
- Good
- inspected May 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 270 ft
- 2 main spans
- Daily traffic
- 4,400
- 2021 count
- Owner
- State
- State Highway Agency
About this bridge
SR4121 over I73 & US421 is a steel continuous stringer/multi-beam or girder carrying SR4121 over I73 & US421 in Guilford County, North Carolina. It was built in 2008, so it is 17 years old, younger than the North Carolina average of 38.7 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 4,400 vehicles a day, roughly 7% of them trucks, projected to reach 8,800 by 2040. The structure is 270 ft (82.2 m) long and 52 ft wide. If it were closed, the detour would be 0.6 mi (1 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was SR4121 over I73 & US421 built?
It was built in 2008, making it 17 years old in 2025.
What condition is SR4121 over I73 & US421 in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in May 2024.
How much traffic does SR4121 over I73 & US421 carry?
About 4,400 vehicles per day (2021 count), of which roughly 7% are trucks.
How long is SR4121 over I73 & US421?
The structure is 270 ft (82.2 m) long with a longest span of 140 ft (42.6 m) and a deck 52 ft wide.
Who owns SR4121 over I73 & US421?
It is owned by the State Highway Agency.